EP2345947A2 - Überspannungssichere Stromversorgung - Google Patents

Überspannungssichere Stromversorgung Download PDF

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Publication number
EP2345947A2
EP2345947A2 EP11002330A EP11002330A EP2345947A2 EP 2345947 A2 EP2345947 A2 EP 2345947A2 EP 11002330 A EP11002330 A EP 11002330A EP 11002330 A EP11002330 A EP 11002330A EP 2345947 A2 EP2345947 A2 EP 2345947A2
Authority
EP
European Patent Office
Prior art keywords
voltage
electrically connected
output
charge pump
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11002330A
Other languages
English (en)
French (fr)
Other versions
EP2345947B1 (de
EP2345947A3 (de
Inventor
Ronald Stuart Davison
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hamilton Sundstrand Corp
Original Assignee
Hamilton Sundstrand Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hamilton Sundstrand Corp filed Critical Hamilton Sundstrand Corp
Publication of EP2345947A2 publication Critical patent/EP2345947A2/de
Publication of EP2345947A3 publication Critical patent/EP2345947A3/de
Application granted granted Critical
Publication of EP2345947B1 publication Critical patent/EP2345947B1/de
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
    • G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
    • G05F1/571—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overvoltage detector

Definitions

  • the present invention relates to regulated voltage supply circuits and, more particularly, to regulated voltage supply circuits with protection against the effects of voltage magnitude surges.
  • Modem aircraft have many electrical and electronic devices positioned and operating therein. All such devices, unless batteries or generators, require electrical power to be supplied thereto to operate, and usually also require, in at least some portions thereof, that this power be regulated in some sense. Typically, a voltage from a voltage source is supplied to such devices with the magnitude thereof regulated to some extent so as to generally remain at or near some selected value. Often, the supply electrical conductors over which such regulated voltage is supplied from the source to the devices extend for substantial distances through the aircraft and are connected to plural ones of such devices.
  • the present invention provides an overvoltage protection circuit for protecting a pass element in a controlled voltage supply circuit electrically connected between a circuit power supply interconnection terminal region suited for electrical connection to a circuit power supply and an output terminal region between which the pass element can be directed at a control region to provide a conductive path of a selected conductivity, the pass element being protected from voltage surges that may occur on the circuit power supply interconnection with respect to a voltage reference interconnection.
  • a voltage reference capable of maintaining a substantially constant voltage between a pair of terminating regions for a range of electrical currents through that pair of terminating regions is provided electrically connected in series with a voltage divider capable of maintaining at an output thereof a selected fraction of the voltage between a pair of terminating regions.
  • a threshold switch having first and second terminating regions and a control region by which that threshold switch is capable of being directed to provide a conductive path between threshold device first and second terminating regions of a selected conductivity has the threshold device first terminating region and control region each being electrically connected to a corresponding one of the voltage divider output and one of the voltage divider terminating regions, and has the second terminating region being coupled to the pass element control region.
  • Figure 1 is a schematic diagram of an electronic circuit embodying the present invention.
  • FIG. 1 A schematic diagram is provided in Figure 1 of a magnitude regulating electronic voltage supply circuit, 10, for providing a voltage at a selected value to other user circuits (not shown) connected to this voltage supply circuit to allow them to operate based on this provided voltage.
  • An unregulated, or insufficiently regulated, source of voltage (not shown) provides voltage to circuit 10 having a magnitude usually at or near some selected nominal value with respect to a ground voltage reference terminal, 11, in supply circuit 10, this voltage supplied through a positive voltage source terminal electrically connected to a supplied voltage terminal, 12, in supply circuit 10.
  • a control terminal, 13, is operated by a voltage supply operation initiation circuit (not shown) that selects between switching voltage supply circuit 10 off so as to not supply voltage to other user circuits at an output terminal thereof, 14, through placing control terminal 13 at a sufficiently large voltage with respect to ground voltage reference terminal 11, and switching voltage supply circuit 10 on so as to supply a regulated output voltage to the user circuits at output terminal 14 through placing control terminal 13 at a sufficiently small voltage with respect to terminal 11 while limiting the electrical current therethrough.
  • a voltage supply operation initiation circuit (not shown) that selects between switching voltage supply circuit 10 off so as to not supply voltage to other user circuits at an output terminal thereof, 14, through placing control terminal 13 at a sufficiently large voltage with respect to ground voltage reference terminal 11, and switching voltage supply circuit 10 on so as to supply a regulated output voltage to the user circuits at output terminal 14 through placing control terminal 13 at a sufficiently small voltage with respect to terminal 11 while limiting the electrical current therethrough.
  • Control terminal 13 is electrically connected to the otherwise unconnected base of one of a pair of pnp bipolar transistors, 15, that are electrically connected to one another in a Darlington circuit configuration.
  • the emitter of transistor pair 15 is electrically connected to a series connected pair of shorted bridge configuration resistor circuits, 16 and 17, at the interconnection between shorted bridge configuration resistor circuit 17 and a bidirectional zener diode, 18, that is also electrically connected in series with circuits 16 and 17.
  • Bidirectional zener diode 18 has a selected breakdown voltage greater than the nominal value of voltage supplied to voltage terminal 12, typically a quarter to a third greater.
  • the series connected group of shorted bridge configuration resistor circuits 16 and 17 and bidirectional zener diode 18 are electrically connected between supplied voltage terminal 12, to which shorted bridge configuration resistor circuit 16 has one end connected, and ground voltage reference terminal 11 to which bidirectional zener diode 18 has one end connected.
  • Shorted bridge configuration resistor circuit 16 has, at the end thereof connected to supplied voltage terminal 12, a pair of resistors, 16' and 16", electrically connected in parallel with one another and both connected at one end to supplied voltage terminal 12.
  • a second pair of resistors, 16"' and 16"", in shorted bridge configuration resistor circuit 16 are electrically connected in parallel with one another and both are connected at one end thereof to one end of parallelly connected resistors 16' and 16" and at the opposite end thereof to shorted bridge configuration resistor circuit 17.
  • These resistors in shorted bridge configuration resistor circuit 16 are of a relatively large resistance value and are provided as four resistors rather than one resistor of an equivalent value to be able to dissipate more heat developed therein by electrical currents therethrough.
  • Shorted bridge configuration resistor circuit 17 has, at the end thereof connected to shorted bridge configuration resistor circuit 16, a pair of resistors, 17' and 17", electrically connected in parallel with one another and both connected at one end to shorted bridge configuration resistor circuit 16.
  • a second pair of resistors, 17"' and 17"", in shorted bridge configuration resistor circuit 17, are electrically connected in parallel with one another and both are connected at one end thereof to one end of parallelly connected resistors 17' and 17" and at the opposite end thereof to bidirectional zener diode 18.
  • These resistors in shorted bridge configuration resistor circuit 17 are of relatively small resistance values, typically having an equivalent resistance of one hundredth that of the equivalent resistance of the resistors in shorted bridge configuration resistor circuit 16 as an example.
  • a noise suppression capacitor, 17" has each side thereof electrically connected to a corresponding one of the two ends of shorted bridge configuration resistor circuit 17.
  • Voltage regulator chip 20 has a resistor, 21, electrically connected at one end to a regulated voltage output thereof, and the other end of the resistor to an output voltage sensing input of regulator chip 20.
  • a resistor, 22, is electrically connected at one end to the output voltage sensing input of regulator chip 20 and at the other end to ground voltage reference terminal 11. The selection of magnitudes of the resistances of these two resistors allows selecting the magnitude of the output voltage provided by voltage regulator chip 20 which is typically from a third to a half of the nominal voltage supplied to supplied voltage terminal 12.
  • a further noise suppression capacitor, 23, has one end electrically connected to the output of voltage regulator chip 20 and its opposite end electrically connected to ground voltage reference terminal 11.
  • Voltage regulator 20 being a series pass element regulator will draw no more current than that which has been needed theretofore at its output by its load with the voltage surge instead being taken up across its series pass element along with shorted bridge configuration resistor circuits 16 and 17.
  • the output voltage provided at the output of voltage regulator chip 20 is provided through a small value current limiting resistor, 24, to an astable multivibrator arrangement in a charge pump circuit arrangement that is for providing a voltage between the gates and sources of a plurality of parallelly interconnected, n-channel, metal-oxide-semiconductor field-effect transistors (MOSFETs) operated in a source-follower circuit arrangement.
  • MOSFETs metal-oxide-semiconductor field-effect transistors
  • These MOSFETs serve as the output power pass devices in a series type output voltage regulator to provide regulated output voltage at output terminal 14 of supply circuit 10 based on the nominal value voltage provided thereto at supplied voltage terminal 12.
  • the astable multivibrator arrangement has a pair of voltage divider resistors, 25 and 26, electrically connected in series with one another and having one end thereof electrically connected to the end of resistor 24 not connected to the output of voltage regulator chip 20, to be between resistor 24 and ground voltage reference terminal 11 to which the other end of the voltage divider is electrically connected.
  • a noise suppression capacitor, 27, has each side thereof electrically connected to a corresponding one of the two ends of this voltage divider.
  • resistor 24 is connected to a positive voltage supply lead, 28, which together with a relatively negative voltage supply lead, 29, from ground voltage reference terminal 11, form the voltage supply and ground return interconnections for a commercially available integrated circuit chip comparator, 30, and are electrically connected thereto at the corresponding comparator interconnection terminals.
  • the interconnection junction of resistors 25 and 26 forming the voltage divider, just described above, provides a comparator reference voltage value for comparator 30 by being electrically connected to the positive input terminal of that comparator.
  • a resistor, 31, is electrically connected between the output terminal of comparator 30 and the positive input terminal of that comparator to thereby provide positive feedback to result in a regenerative process following a sufficient voltage "triggering" excursion at the comparator negative input terminal with a polarity matching that of the current output state and also in a hysteretic switching characteristic.
  • This regenerative process causes the output to rapidly change toward next being in the opposite one of two possible output states alternative to that state which was current at the "triggering", these states being approximately at the extremes in the comparator output voltage operating range between the two voltage values to which the comparator is connected, the voltage at resistor 24 and ground at ground voltage reference terminal 11.
  • a further resistor, 32 is electrically connected between the output terminal of comparator 30 and the negative input terminal of that comparator to thereby provide negative feedback and to charge and discharge a capacitor, 33, electrically connected between that negative input terminal and ground voltage reference terminal 11.
  • the charging and discharging of capacitor 33 provides sequential "triggerings" at the negative input terminal of comparator 30 so that neither of the comparator output voltage states is stable over time and so oscillates between those output voltage states.
  • a further resistor, 34 is electrically connected between the end of resistor 24 and the output of comparator 30 to provide supplementary electrical current at this output when the output is in or near the relatively positive output voltage state, current which is drawn away at the comparator output when in or near the negative output voltage state.
  • This oscillating of the output voltage of comparator 30 between its two voltage extremes serves to charge and discharge a capacitor, 35, connected on one end thereof to the output of comparator 30 and on the other end to the interconnection junction between two diodes, 36 and 37, an arrangement which provides isolation between voltage values occurring on either side of capacitor 35 with respect to voltages that consist of sufficiently small frequency components.
  • Capacitor 35 is connected to the anode of diode 36 and to the cathode of diode 37.
  • the anode of diode 37 is connected through two current limiting resistors, 38 and 39, electrically connected in series with one another, to output terminal 14 of supply circuit 10.
  • the cathode of diode 36 is electrically connected to several circuit components including the cathode of a zener diode, 40, which has its anode electrically connected to ground voltage reference terminal 11.
  • the breakdown voltage selected for zener diode 40 sets the output voltage provided by supply circuit 10 on output terminal 14 thereof at the value of that breakdown voltage less the gate to source voltage of the supply circuit 10 pass MOSFETS to be described below.
  • the cathode of diode 36 is electrically connected to the cathode of a further zener diode, 41, having its anode electrically connected to the junction between resistors 38 and 39, and to one side of each of a capacitor, 42, and a resistor, 43, both of which have their opposite sides also electrically connected to the junction between resistors 38 and 39.
  • the breakdown voltage for zener diode 41 is on the order of eight tenths that of the output voltage of voltage regulator 20 and limits the gate to source voltage of the supply circuit 10 pass MOSFETS to be described below.
  • the capacitance of capacitor 42 is much larger than that of capacitor 35, typically on the order of twenty times as large for example.
  • the cathode of diode 36 is electrically connected to one end of each of a plurality of resistors, 44, 44', 44" and 44"'.
  • the opposite ends of each of these resistors are each electrically connected to the gate of a corresponding one of a plurality of parallelly interconnected, n-channel, metal-oxide-semiconductor field-effect transistors (MOSFETs), 45, 45', 45" and 45"', which are the output power transistors serving as the pass elements of this series regulator formed by supply circuit 10.
  • MOSFETs metal-oxide-semiconductor field-effect transistors
  • the sources of each of these MOSFETs are electrically connected to output terminal 14 of supply circuit 10, and the drains of each of these MOSFETs are electrically connected to supplied voltage terminal 12.
  • An interrupted supply voltage maintenance capacitor, 46 has one side thereof electrically connected to output terminal 14 of supply circuit 10 and the other side electrically connected to ground voltage reference terminal 11.
  • This capacitor has a relatively large capacitance chosen to be large enough to maintain the voltage across an output load connected between output terminal 14 and ground terminal 11 for times exceeding those occurring for circuit protection interruptions in the operation of supply circuit 10 as a result of encountering voltage surges on supplied voltage terminal 12.
  • capacitor 35 When the output of comparator 30 is in its low state, capacitor 35 is charged (discharged from previous charge) from the voltage at output terminal 14 (set by the load and capacitor 46) through resistors 38 and 39 and diode 37 with diode 36 being reversed biased to prevent discharging capacitor 42.
  • the oscillatory change in comparator 30 to the opposite output voltage high state leads to the output of comparator 30, resistor 34 and charged capacitor 35 together charging relatively larger capacitors 42 and 46 with the charging current limited by resistor 39.
  • the voltage across capacitors 42 and 46 is limited in two respects, first, the voltage across capacitor 42, which sets and maintains the gate to source voltage of each of pass MOSFETS 45, 45', 45" and 45"', is limited by the breakdown voltage of zener diode 41 to protect those gates. Further, the voltage drop across capacitors 42 and 46 connected in series with one another between the cathode of diode 36 and ground voltage reference terminal 11 is limited by the breakdown voltage of zener diode 40. This last breakdown voltage less the gate to source voltage of each of pass MOSFETS 45, 45', 45" and 45"' is the maximum output voltage supplied at output terminal 14 of supply circuit 10.
  • Transistor 50 has its emitter electrically connected to the junction of shorted bridge configuration resistor circuits 16 and 17 and has its base electrically connected through a current limiting resistor, 51, to the junction of shorted bridge configuration resistor circuit 17 and bidirectional zener diode 18.
  • transistor 50 will be switched on as substantial additional electrical current flows in shorted bridge configuration resistor circuit 17 and through bidirectional zener diode 18 as a result of the voltage surge on supplied voltage terminal 12 exceeding the breakdown voltage of that zener diode. That breakdown voltage maintains the voltage value at resistor 51 connected to the base of transistor 50, and also across transistor pair 15 and the input of voltage regulator 20.
  • This voltage value at the junction of resistor 53 and the anode of diode 54 is set by the resistor values and the breakdown voltage of zener diode 52 to be more than that supplied at the output of voltage regulator 20 by at least the emitter to base voltage of a further pnp bipolar transistor, 56, having its emitter electrically connected to this junction.
  • the base of transistor 56 is connected to the end of resistor 24 opposite the end thereof connected to the regulated output of voltage regulator 20, and the collector of transistor 56 is connected to the positive input terminal of comparator 30.
  • the switching on of transistor 50 increases the voltage on the emitter of transistor 56 sufficiently to switch on this latter transistor into saturation to thereby increase the voltage on the positive input terminal of comparator 30 above the voltage supplied to its positive voltage terminal through interconnection 28 thereby ceasing its output voltage oscillation.
  • the voltage on capacitor 42 setting the voltage between the gate and source of each of pass MOSFETS 45, 45', 45" and 45"' is quickly dissipated through resistor 43 thereby switching off those MOSFETs.
  • the switching on of transistor 50 can be caused to occur at different selected values of sufficient surge voltage increases between supplied voltage terminal 12 and ground voltage reference terminal 11 by adjusting the value of the equivalent resistance in shorted bridge configuration resistor circuit 17, through suitably selecting the resistance values of the resistors therein, relative to the equivalent resistance in shorted bridge configuration resistor circuit 16.
  • the switching on of transistor 50 is set to occur at a relatively smaller surge voltage increase value (even though the surge voltage reaches a much greater value peak) by such resistor value selections, fewer members may be needed in the plurality of parallelly interconnected, n-channel, MOSFETs 45, 45', 45" and 45"' as there will be less voltage dropped across them thus allowing larger currents through each so that the total current can be split between fewer of them while still leaving each in its safe operating area.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Electronic Switches (AREA)
  • Emergency Protection Circuit Devices (AREA)
EP11002330.6A 2007-03-30 2007-12-31 Überspannungssichere Stromversorgung Ceased EP2345947B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US92116207P 2007-03-30 2007-03-30
US11/807,230 US7869176B2 (en) 2007-03-30 2007-05-25 Surge protected power supply
EP20070255090 EP1975759B1 (de) 2007-03-30 2007-12-31 Überspannungssichere Stromversorgung

Related Parent Applications (3)

Application Number Title Priority Date Filing Date
EP07255090.8 Division 2007-12-31
EP20070255090 Division EP1975759B1 (de) 2007-03-30 2007-12-31 Überspannungssichere Stromversorgung
EP20070255090 Division-Into EP1975759B1 (de) 2007-03-30 2007-12-31 Überspannungssichere Stromversorgung

Publications (3)

Publication Number Publication Date
EP2345947A2 true EP2345947A2 (de) 2011-07-20
EP2345947A3 EP2345947A3 (de) 2012-07-04
EP2345947B1 EP2345947B1 (de) 2017-06-28

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EP11002330.6A Ceased EP2345947B1 (de) 2007-03-30 2007-12-31 Überspannungssichere Stromversorgung
EP20070255090 Active EP1975759B1 (de) 2007-03-30 2007-12-31 Überspannungssichere Stromversorgung

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Application Number Title Priority Date Filing Date
EP20070255090 Active EP1975759B1 (de) 2007-03-30 2007-12-31 Überspannungssichere Stromversorgung

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US (1) US7869176B2 (de)
EP (2) EP2345947B1 (de)

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CN104750159A (zh) * 2015-03-24 2015-07-01 华南理工大学 一种过压保护电路

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US8553381B2 (en) 2011-05-27 2013-10-08 Hamilton Sundstrand Corporation Gradually reducing resistive clamp
US9537307B2 (en) 2011-07-19 2017-01-03 Hamilton Sundstrand Corporation Overvoltage protection method and device
US8618887B2 (en) 2011-09-29 2013-12-31 Hamilton Sundstrand Corporation Configurable spread spectrum oscillator
US9583324B2 (en) 2013-07-23 2017-02-28 Shimadzu Corporation High-voltage power unit and mass spectrometer using the power unit
US9391059B2 (en) * 2014-08-20 2016-07-12 Hamilton Sundstrand Corporation Solid-state power controller channel protection systems and methods
US9673618B2 (en) 2014-11-21 2017-06-06 Hamilton Sundstrand Corporation Balancing parallel solid-state power controller channel currents systems and methods
US9344078B1 (en) * 2015-01-22 2016-05-17 Infineon Technologies Ag Inverse current protection circuit sensed with vertical source follower
CN109449910B (zh) * 2018-12-26 2023-11-21 上海艾为电子技术股份有限公司 一种保护电路
CN116409184B (zh) * 2023-06-12 2023-08-22 深圳市斯帕克电气有限公司 基于保护端子电路的新能源汽车安全充电系统

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CN104750159B (zh) * 2015-03-24 2016-04-13 华南理工大学 一种过压保护电路

Also Published As

Publication number Publication date
EP2345947B1 (de) 2017-06-28
EP1975759B1 (de) 2015-05-13
EP2345947A3 (de) 2012-07-04
EP1975759A1 (de) 2008-10-01
US20080239604A1 (en) 2008-10-02
US7869176B2 (en) 2011-01-11

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